Hydraulic jack.



F. I. JOYCE.

HYDRAULIC JACK. APPLIGATICN FILED MAR. 1, 1909.

11,046,073. Patented Dec. 3, 1912.

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iinessas F. I. JOYCE.

HYDRAULIC JACK.

. APPLIU.ATION. FILED MAR. l, 1909. 1,046,073. Patented Dec.3,1912.

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Ewen/02" McJ/ w FRANK I. JOYCE, F DAYTON, OHIO.

HYDRAULIC JACK.

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Specification of Letters Patent.

Patented Dec. 3, 1912.

Application filed March 1, 1909. Serial No. 480,537.

7 To all whom it may concern:

Be it known that. I, FRANK I. Joron, a

ton, county of Montgomery, and State of Ohio, have invented certain new and useful Improvements in Hydraulic Jacks, of which the followin is a full, clear, and exact description, re f erence being had to the accompanying drawings, forming part of this specification.

. My invention relates to improvements in hydraulic jacks, more particularly of the outside pump type, in which the pump cylinder and pump is outside of the ram cylinder, and at a distance therefrom, but usually in close proximity thereto, and mounted on an extension of the base.

The object of the invention is to provide a construction for this class of jacks which are usually designed for high tonnages, in which the ram may be automatically moved rapidly to the load without the necessity of any additional pump, or the manual adjustment of any valves or levers.

In the drawings Figure 1 is a central vertical section of my improved construction. Fig. 2 is a plan View ofthe pump block. Fig. 3' is a horizontal cross section of the jack, taken on the lines 33 of Fig. 1, and Fig. 4 is a horizontal cross section taken on the lines 4-4 of Fig. 1.

1 is the base provided with a sideexten sion 2, within which the working parts of the jack are mounted.

within which is mounted the ram 6, carrying at its upper end the ram head 7.

Within the extension 2 of the base, is formed the pump cylinder 4, with the pump block 8 secured therein. The pump block 8 is provided with the usual central recess 9, within which works the piston head 10, of the pump rod 11. The upper end of tht pump rod 11 is enlarged and provided with the recess 12, which is engaged by the spherical head 13, of the hub 14, secured on the rock shaft 15, which is provided with suitable bearings in the casing, and which extends through the case-and is provided on the' outside with an operating lever, not shown, by meansof which the pump rod and piston head is operated.

In the extension casing and outside of the pump cylinder, is the cistern 16, which is filled with the operating fluid for the pump. This cistern is connected with the plunger Secured in vertical position in th1s base, is the ram cylinder 5,

chamber 9 of the pump through the passageway 17, from which passageway the passageway 18 extends and opens into a vertical passageway 19, in which is located the valve 37 opening upward. From the passageway 18 a branch passage 20 also extends leading into the suction passageway 21 in which is located the suction valve 22,=and thence passageway 21 connects with the vertical pas sage 41 opening into the plunger chamber 9.

23 is the discharge valve from the piston chamber which opens into a passageway 21 connecting and opening into the ram chamber 25. n

The suction valve 22 is provided with the usual trip rod for tripping the valve, the trip rod stop being indicated by dotted lines 26 and the trip rod by dotted lines 27.

The parts of the hydraulic jack which have just been briefly described, are the ordinary and usual parts of the jack as heretofore constructed, and there is no need of any more particular descrlptlon.

In order that the ram may be raised quickly to the load, I secure on the pump rod 11, an auxiliary plunger 28, and through this plunger which is of the same diameter as the pump cylinder, I form a small opening 29, below which is the recess30, to hold the ball valve 31 which, when the pump rod and plunger are moving upward, will close the passageway 32, underneath the valve which opens into the chamber 33 between the top of the pump block and the auxiliary plunger. 34 is a passageway closed by the valve 35, from the chamber 33 into the passageway 24, which leads to the ram chamber. Extending also through the top surface of the pump, block, is a passageway 36 which opens into the passageway 19 from the cistern supply. This passageway 36 is not in the same vertical plane as that upon which Fig. 1 is taken, and therefore the passageway 36 only shows in dotted lines in Fig. 1 of the drawings, and it will be understood that the passageway 36 from the top of the pump block opens into the pas from the cistern will fill in the chamber 33 at the same time the suction of the pump piston in the plunger chamber 9 will open the suction valve 22, and the liquid from. the cistern will till the plunger chamber through passageways 17, 18, 20, 21, and 41.

Upon the down stroke of the pump rod,

and the auxiliary plunger, the valve 31 will open, but the passageway 29 is so small that before the ram head reaches the load the liquid cannot flow through the passageway 29, fast enough, and substantially all of the liquid in the chamber 33, will be forced through the passageway 34, and the valve 35, and thus directly into the ram chamber, thus raising the ram very rapidly.

. When the load is reached, however, the increased pressure .assisted by the relief afforded by the opening 29, causes the valve 35 to close and remain inactive and the plunger 10 takes up the work in the normal way. In the meantime the liquid which on the up stroke of the plunger enters the chamber 33, will on the down stroke of the plunger'pass through opening 32 past valve 31 and through opening 29 to the space above plunger 28 which is in free communication with the cistern.

The action therefore of the device is entirely automatic. When there is no load to be raised, the auxiliary plunger 28 does the work. \Vhen the load is reached, the auxiliary plunger has no function, and the main plunger, working in the pump block, raises the load.- For the purpose of lowering the jack, the piston 28 is depressed until the trip rod 27 and the trip rod stop 26, which are immediately over the valve 22, are depressed and the valve 22 open. The plunger 10 at the same time engages and opens the valve 23, and the opening of the valves 2-2 and 23 in this way gives a clear passage from the ram chamber 25 into the cistern 16.

Having thus described my invention, what I claim as new and desire to secure by Letters Patent, is:

1. In a jack of the class described, provided with a ram, pump block, pump cylinder and pump rod, an auxiliary plunger secured to the pump rod above ,the pump block, forming an enlarged suction cham-- ber above the pump block, with inlet and outlet valves for said chamber and with a passageway of small size through the auxiliary plunger and means for automatically closing said passageway on the upstroke of the auxiliary plunger to bring said plunger into action to draw the pump liquid into the pump cylinder on the upstroke, and to force said liquid into the ram cylinder on the downstroke of the auxiliary plunger.

2. In a jack of the class described, provided with a ram, pump block,. pump cylinder and pump rod, an auxiliary plunger secured to the pump rod above the pump block, forming an enlarged suction chamber above the pump block, with inlet and outlet valves for said chamber and with a passageway of small size through the auxiliary plunger, and a suction valve for said pas sageway arranged to close on the upstroke of the auxiliary plunger to bring said plunger into action to draw the pump liquid into the pump cylinder on the upstroke, and to force said liquid into the ram chamber on the downstroke of the auxiliary plunger.

3. In a jack of the class described, provided with a ram, and a pump block, a pump cylinder, and pump rod outside of the ram cylinder, an auxiliary plunger secured to the pump rod above the pump block forming an enlarged suction chamber above the pump block, and a passageway of small size through the plunger, a suction valve for said passageway to close the passageway on the upstroke of the plunger, with a passageway through the pump block from the cistern, with valve therefor, whereby the auxiliary plunger will be brought into action to.

draw the pump liquid into the pump cylinder through said passageway on the upstroke and a separate passageway from the pump cylinder through the pump block to the ram chamber with check valve therein, whereby on the down stroke the pump liquid will be forced directly into the ram chamber by the auxiliary plunger.

FRANK I. JOYCE. Witnesses S. W. FROEI-ILE, R. G. STONE. 

